Small face Narrow face Objective measurement of the upper facial width is made with spreading calipers. The tips of the calipers are passed over the zygomatic arches until the maximum width is determined. Objective measurement of the lower faces is made with spreading calipers, with the tips firmly pressed against the inferomedial surface of the angle of the mandible. Thin face UMLS:C1849121 HP:0000318 Decreased transverse dimension of face Decreased width of face Transverse hypoplasia of face Narrow facies Horizontal hypoplasia of face Transverse insufficiency of face Horizontal deficiency of face Transverse deficiency of face Thin facies Decreased horizontal dimension of face UMLS:C1837463 Horizontal insufficiency of face Bizygomatic (upper face) and bigonial (lower face) width are both more than 2 standard deviations below the mean (objective); or, an apparent reduction in the width of the upper and lower face (subjective). Narrow face Decreased breadth of face HP:0000275